US5077481A - Optical probe for measuring light transmission of liquid - Google Patents

Optical probe for measuring light transmission of liquid Download PDF

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Publication number
US5077481A
US5077481A US07/603,593 US60359390A US5077481A US 5077481 A US5077481 A US 5077481A US 60359390 A US60359390 A US 60359390A US 5077481 A US5077481 A US 5077481A
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United States
Prior art keywords
end surface
openings
liquid
transparent
optical
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Expired - Fee Related
Application number
US07/603,593
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English (en)
Inventor
Robert A. Hoult
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Applied Biosystems Inc
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Perkin Elmer Corp
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Priority to US07/603,593 priority Critical patent/US5077481A/en
Assigned to PERKIN-ELMER CORPORATION, THE, A CORP. OF NEW YORK reassignment PERKIN-ELMER CORPORATION, THE, A CORP. OF NEW YORK ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: HOULT, ROBERT A.
Priority to DE4135021A priority patent/DE4135021C2/de
Priority to JP27787891A priority patent/JP3400465B2/ja
Application granted granted Critical
Publication of US5077481A publication Critical patent/US5077481A/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/85—Investigating moving fluids or granular solids
    • G01N21/8507—Probe photometers, i.e. with optical measuring part dipped into fluid sample

Definitions

  • This invention relates to measuring light transmission of liquids, and particularly to an optical probe for immersion into liquids for measurement.
  • One conventional class of spectrophotometers is utilized for measuring optical transmission of liquid samples in the spectral range of near infrared to ultraviolet.
  • precision in measurements is particularly related to uniformity in pathlength in the optical train at the liquid sample, and minimizing reflection and refraction effects.
  • an optical probe device should be small, portable, reliable and rugged. Fiber optics provide a basis for a suitable probe that may be inserted into liquid samples.
  • U.S. Pat. No. 4,431,307 (Suovanieme) teaches arranging the liquid containers ("cuvettes") in a matrix, with each container having its own optics.
  • the use of optical fibers immersed in liquid is disclosed in U.S. Pat. No. 4,403,861 (Boisde et al), apparently with a simple gap between fiber ends for passing light through a portion of the liquid. This approach potentially solves some of the above problems but does not address any need or method for incorporating precision optics into the liquid.
  • An object of the invention is to provide a novel optical probe for insertion into liquids for measurement of light transmission characteristics of the liquid by a photospectrometer.
  • a further object is to provide such an optical probe having improved optical precision.
  • Another object is to provide such a probe that is small, portable, reliable and rugged.
  • an optical probe including a tubular housing with a cylindrical wall having one or more proximate openings therein.
  • a solid cylindrical member is formed of transparent material with a flat transparent end surface and an opposing curved surface having a selected curvature and being silvered so as to form an internally concave reflector. The cylindrical member is retained in the housing with the transparent end surface located adjacent to the openings.
  • a transparent solid rod member has a flat first end surface and a flat second end surface parallel to the first end surface.
  • the rod member is retained in the housing with the second end surface located adjacent to the openings and spaced from the transparent end surface parallel thereto so as to define a cavity therebetween.
  • liquid passes through the openings into the cavity.
  • the first end surface is spaced from the concave reflector cooperatively with the selected curvature, the cavity and indices of refraction of the reflector member, the rod member and the liquid so that selected first and second conjugate focal spots of the concave reflector are located in a laterally spaced relationship substantially at the first end surface.
  • a first optical fiber with a planar end is affixed transparently to the first end surface in alignment with the first focal spot
  • a second optical fiber with a planar end is affixed transparently to the first end surface in alignment with the second focal spot.
  • Light entering through the first optical fiber thereby passes twice through the liquid in the opening while being reflected by the concave reflector into the second optical fiber with minimal refraction and reflection losses.
  • cylindrical wall proximate the cavity comprises three equally configured legs so that the openings are configured as three arcuately spaced openings to the cavity.
  • cylindrical member and the rod member should have respective cylindrical surfaces blackened against extraneous reflections.
  • FIG. 1 is a longitudinal section of an optical probe according to the invention.
  • FIG. 2 is a cross section taken at 2--2 of FIG. 1.
  • an optical probe 10 includes a tubular housing 12 with a cylindrical wall 14 of stainless steel having three equal and arcuately spaced proximate openings 16 therein. These openings are formed conveniently with the cylindrical wall having a portion configured with three equally spaced legs 18, as shown in cross section in FIG. 2.
  • the housing otherwise has a uniform inside diameter 20 except for a bottom end 22 that may have a lesser diameter 24 to form an annular shoulder 26. That bottom may be closed but the other end 28 is open.
  • a solid cylindrical member 30 is made of glass or fused quartz or other transparent material. This member is bonded by a flat transparent end surface 32 and an opposite curved surface 33. The curved surface is silvered with aluminum or the like and has a selected curvature so as to form an internally concave reflector. The member 30 is retained in the housing 12 with cement against the shoulder 26 with the transparent surface adjacent to the openings 16.
  • a transparent solid rod member 34 has a flat first end surface 36 and a flat second end surface 38 parallel to the first end surface. These end surfaces, as well as the transparent surface 32 of the cylindrical member 30, are polished and accurately parallel to each other.
  • the rod member 34 is retained with cement in the housing 12 with the second end surface 38 adjacent to the openings 16 and spaced from the transparent surface 32 to define a cavity 40 therebetween.
  • the cavity is directly accessed through the openings 16 so that upon immersion of the probe into a liquid 42, the liquid passes through the openings into the cavity.
  • the three legs 18 and openings 16 provide for good support and easy access to the chamber for cleaning. Also, as shown, the openings may extend over the transparent members 30,34.
  • the first end surface 36 is spaced from the concave reflector 33 at a distance selected cooperatively with the selected curvature and with indices of refraction of the reflector member, the rod member and the liquid, such that selected first and second conjugate focal spots 44,46 of the concave reflector 33 are positioned in laterally spaced relationship at the first end surface 36.
  • a first optical fiber 48 with a flat end is affixed transparently to the first end surface 36 in alignment with the first focal spot 44.
  • a second optical fiber 50 with a flat end is affixed similarly to the first end surface 52 in alignment with the second focal spot 46.
  • Strength and rigidity may be achieved by first affixing the fibers through holes in a disk 52 cemented into the housing 14 contacting end surface 36.
  • the flat ends of the fibers may be polished in the disk before attachment.
  • the fibers at the disk each should be angled so as to aim at the optical center 53 of the reflective surface 33.
  • the rod member 34 has an annular groove 60 therein for defining an optical aperture for the light. This also provides an anchoring location for cement 62.
  • a high degree of precision is achieved with a uniform pathlength of the light passing through the liquid. Refraction and reflection losses are minimized in the disclosed configuration of the probe, the parallel surfaces and, with elimination of air from the optical train, a similarity of indices of refraction of glass or quartz and most liquids.
  • a glass may be selected having an index of refraction substantially the same as that of the intended liquid.
  • the cylindrical member 30 and the rod member 34 preferably have their respective cylindrical boundary surfaces 64,66 blackened against extraneous reflections, further improving performance.
  • the probe is quite rugged. Suitable dimensions for the probe are 8 mm outside diameter and about 2.5 cm long, excluding the extension of the optical fibers. Such size is convenient for insertion into liquid sample cups 68 conventionally used for spectrophotometers.

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Optical Measuring Cells (AREA)
US07/603,593 1990-10-25 1990-10-25 Optical probe for measuring light transmission of liquid Expired - Fee Related US5077481A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US07/603,593 US5077481A (en) 1990-10-25 1990-10-25 Optical probe for measuring light transmission of liquid
DE4135021A DE4135021C2 (de) 1990-10-25 1991-10-23 Optische Messsonde zur Messung der Lichttransmission von Flüssigkeiten
JP27787891A JP3400465B2 (ja) 1990-10-25 1991-10-24 光学プローブ

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US07/603,593 US5077481A (en) 1990-10-25 1990-10-25 Optical probe for measuring light transmission of liquid

Publications (1)

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US5077481A true US5077481A (en) 1991-12-31

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JP (1) JP3400465B2 (de)
DE (1) DE4135021C2 (de)

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2280954A (en) * 1993-08-09 1995-02-15 Vickers Inc Optical fluid contamination monitor
US5428696A (en) * 1993-07-15 1995-06-27 The Perkin-Elmer Corporation Photometric instrument with optical fibers for analyzing remote samples
EP0702524A1 (de) * 1993-03-05 1996-03-27 SAHAGEN, Armen, N. Sensor zur überwachung einer flüssigkeit und/oder eines gases
US5694206A (en) * 1996-03-01 1997-12-02 Analytical Spectral Devices, Inc. Spectrophotometric system using a pH/ISE meter for calibration
US5751415A (en) * 1996-05-13 1998-05-12 Process Instruments, Inc. Raman spectroscopy apparatus and method for continuous chemical analysis of fluid streams
US5781284A (en) * 1996-04-24 1998-07-14 Infante; David A. System for detecting impurities contained in a fluid medium
US5919707A (en) * 1994-12-22 1999-07-06 Nalco Chemical Company Monitoring of rolling oil emulsions
US6028667A (en) * 1996-05-13 2000-02-22 Process Instruments, Inc. Compact and robust spectrograph
US6100975A (en) * 1996-05-13 2000-08-08 Process Instruments, Inc. Raman spectroscopy apparatus and method using external cavity laser for continuous chemical analysis of sample streams
US20010055116A1 (en) * 1999-07-16 2001-12-27 Maczura Anthony K. Optical probes and methods for spectral analysis
US20020039186A1 (en) * 2000-03-10 2002-04-04 Rosenberg Charles W. Von Optical probes and methods for spectral analysis
DE4424961C2 (de) * 1993-07-15 2002-05-08 Perkin Elmer Corp Wählvorrichtung für ein photometrisches Instrument mit Lichtleitfasern zur Analyse von entfernt befindlichen Proben
US20040012777A1 (en) * 2002-07-17 2004-01-22 Rajagopal Vijayakumar Apparatus and process for analyzing a stream of fluid
US6764651B2 (en) 2001-11-07 2004-07-20 Varian, Inc. Fiber-optic dissolution systems, devices, and methods
WO2006136787A1 (en) * 2005-06-20 2006-12-28 Bp Oil International Limited Development of disposable/sealable caps for spectroscopic probes
US20090262345A1 (en) * 2006-05-09 2009-10-22 Johann Gruber Immersion probe for lips apparatuses
US20150160118A1 (en) * 2013-12-06 2015-06-11 BacterioScan Inc. Method And System For Optical Measurements Of Contained Liquids Having A Free Surface
WO2019002651A1 (es) * 2017-06-27 2019-01-03 Fundación Tekniker Sistema y método de monitorización del estado de un fluido
CN109374583A (zh) * 2018-11-28 2019-02-22 南京清研六迪科学仪器有限公司 一种在线药物溶出度光纤传感器检测探头
WO2023041787A1 (de) 2021-09-20 2023-03-23 Implen GmbH Tauchsonde mit variabler pfadlänge

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2320026B1 (de) * 2003-05-02 2013-04-24 Baker Hughes Incorporated Verfahren und vorrichtung zur entnahme von proben in einem bohrloch
EP1736756A1 (de) * 2005-06-20 2006-12-27 Bp Oil International Limited Entwicklung von wegwerfbaren und abdichtbaren Spitzen für NIR-spektroskopische Sonden.
DE102005036898B4 (de) * 2005-08-05 2008-01-10 Hellma Gmbh & Co. Kg Vorrichtung für die Analyse oder Absorptionsmessung an einer kleinen Flüssigkeitsmenge

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4222670A (en) * 1977-07-26 1980-09-16 Olympus Optical Co., Ltd. Liquid sample analyzer
US4229179A (en) * 1978-06-30 1980-10-21 Hycel, Inc. Spectrophotometric measurement in a chemical testing apparatus
US4403861A (en) * 1980-01-23 1983-09-13 Commissariat A L'energie Atomique Photometric analyzer for automatically studying complex solutions
US4431307A (en) * 1981-11-19 1984-02-14 Labsystems Oy Set of cuvettes
US4749276A (en) * 1986-01-23 1988-06-07 Mcdonnell Douglas Corporation Long path absorption cell
US4872753A (en) * 1987-07-22 1989-10-10 Ciba-Geigy Corporation Process cell with temperature compensation

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4222670A (en) * 1977-07-26 1980-09-16 Olympus Optical Co., Ltd. Liquid sample analyzer
US4229179A (en) * 1978-06-30 1980-10-21 Hycel, Inc. Spectrophotometric measurement in a chemical testing apparatus
US4403861A (en) * 1980-01-23 1983-09-13 Commissariat A L'energie Atomique Photometric analyzer for automatically studying complex solutions
US4431307A (en) * 1981-11-19 1984-02-14 Labsystems Oy Set of cuvettes
US4749276A (en) * 1986-01-23 1988-06-07 Mcdonnell Douglas Corporation Long path absorption cell
US4872753A (en) * 1987-07-22 1989-10-10 Ciba-Geigy Corporation Process cell with temperature compensation

Cited By (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0702524A1 (de) * 1993-03-05 1996-03-27 SAHAGEN, Armen, N. Sensor zur überwachung einer flüssigkeit und/oder eines gases
EP0702524A4 (de) * 1993-03-05 1998-12-30 Armen N Sahagen Sensor zur überwachung einer flüssigkeit und/oder eines gases
US5428696A (en) * 1993-07-15 1995-06-27 The Perkin-Elmer Corporation Photometric instrument with optical fibers for analyzing remote samples
US5526451A (en) * 1993-07-15 1996-06-11 The Perkin-Elmer Corporation Photometric instrument with optical fibers for analyzing remote samples
DE4424961C2 (de) * 1993-07-15 2002-05-08 Perkin Elmer Corp Wählvorrichtung für ein photometrisches Instrument mit Lichtleitfasern zur Analyse von entfernt befindlichen Proben
US5438420A (en) * 1993-08-09 1995-08-01 Vickers, Incorporated Monitoring of fluid contamination level wherein the light energy is focused on the fluid passage means
GB2280954B (en) * 1993-08-09 1997-06-11 Vickers Inc Monitoring of fluid contamination level
GB2280954A (en) * 1993-08-09 1995-02-15 Vickers Inc Optical fluid contamination monitor
US5919707A (en) * 1994-12-22 1999-07-06 Nalco Chemical Company Monitoring of rolling oil emulsions
US5694206A (en) * 1996-03-01 1997-12-02 Analytical Spectral Devices, Inc. Spectrophotometric system using a pH/ISE meter for calibration
US5781284A (en) * 1996-04-24 1998-07-14 Infante; David A. System for detecting impurities contained in a fluid medium
US6028667A (en) * 1996-05-13 2000-02-22 Process Instruments, Inc. Compact and robust spectrograph
US6100975A (en) * 1996-05-13 2000-08-08 Process Instruments, Inc. Raman spectroscopy apparatus and method using external cavity laser for continuous chemical analysis of sample streams
US5751415A (en) * 1996-05-13 1998-05-12 Process Instruments, Inc. Raman spectroscopy apparatus and method for continuous chemical analysis of fluid streams
US20010055116A1 (en) * 1999-07-16 2001-12-27 Maczura Anthony K. Optical probes and methods for spectral analysis
US6836325B2 (en) 1999-07-16 2004-12-28 Textron Systems Corporation Optical probes and methods for spectral analysis
US20020039186A1 (en) * 2000-03-10 2002-04-04 Rosenberg Charles W. Von Optical probes and methods for spectral analysis
AU2001240121B2 (en) * 2000-03-10 2005-06-23 Textron Systems Corporation Optical probes and methods for spectral analysis
US6753966B2 (en) * 2000-03-10 2004-06-22 Textron Systems Corporation Optical probes and methods for spectral analysis
US6764651B2 (en) 2001-11-07 2004-07-20 Varian, Inc. Fiber-optic dissolution systems, devices, and methods
US7332128B2 (en) * 2001-11-07 2008-02-19 Varian, Inc. Fiber-optic dissolution systems devices, and methods
US20040247489A1 (en) * 2001-11-07 2004-12-09 Fernando C.J. Anthony Fiber-optic dissolution systems devices, and methods
US6784988B2 (en) * 2002-07-17 2004-08-31 Hamilton Associates, Inc. Apparatus and process for analyzing a stream of fluid
US20040012777A1 (en) * 2002-07-17 2004-01-22 Rajagopal Vijayakumar Apparatus and process for analyzing a stream of fluid
US20050225760A1 (en) * 2002-07-17 2005-10-13 Rajagopal Vijayakumar Apparatus and process for analyzing a stream of fluid
US7224454B2 (en) * 2002-07-17 2007-05-29 Hamilton Associates, Inc. Apparatus and process for analyzing a stream of fluid
US20090310124A1 (en) * 2005-06-20 2009-12-17 Bp Oil International Limited Development of Disposable/Sealable Caps for Spectroscopic Probes
WO2006136787A1 (en) * 2005-06-20 2006-12-28 Bp Oil International Limited Development of disposable/sealable caps for spectroscopic probes
US7838835B2 (en) * 2005-06-20 2010-11-23 Bp Oil International Limted Development of disposable/sealable caps for spectroscopic probes
US20090262345A1 (en) * 2006-05-09 2009-10-22 Johann Gruber Immersion probe for lips apparatuses
US20150160118A1 (en) * 2013-12-06 2015-06-11 BacterioScan Inc. Method And System For Optical Measurements Of Contained Liquids Having A Free Surface
US10048198B2 (en) * 2013-12-06 2018-08-14 Bacterioscan Ltd. Method and system for optical measurements of contained liquids having a free surface
WO2019002651A1 (es) * 2017-06-27 2019-01-03 Fundación Tekniker Sistema y método de monitorización del estado de un fluido
CN109374583A (zh) * 2018-11-28 2019-02-22 南京清研六迪科学仪器有限公司 一种在线药物溶出度光纤传感器检测探头
WO2023041787A1 (de) 2021-09-20 2023-03-23 Implen GmbH Tauchsonde mit variabler pfadlänge
DE102021210443A1 (de) 2021-09-20 2023-03-23 Implen GmbH Tauchsonde mit variabler Pfadlänge
DE102021210443B4 (de) 2021-09-20 2023-07-27 Implen GmbH Tauchsonde mit variabler Pfadlänge

Also Published As

Publication number Publication date
DE4135021C2 (de) 2001-09-27
JPH04265844A (ja) 1992-09-22
JP3400465B2 (ja) 2003-04-28
DE4135021A1 (de) 1992-04-30

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